Dental instrument.



H. M. BROCK.

DENTAL INSTRUMENT. APPLICATION FILED rmw, 1914.

1,13 49, Patented Apr. 20, 1915.

Z72 12272 for HARRY M. 3300K: 0F NOBTI-I YAIKIMA, WASHINGTON.

DENTAL INSTRUMENT.

Specification of Letters Patent.

Patented Apr. 20, 1915.

Application filed February 19, 1914. Serial No..819,667.

To all whom it may concern Be it known that I, HARRY M. BROOK, a citizenof the United States, and a resident of the city of North Yakima, Stateof Washington, have invented a certain new and useful Improvement inDental Instruments, of which the following is a specification.

This invention relates to dental instruments and has for its principalobject to provide means for more quickly attaching and detaching thebits or plugging points to the handle of a dental instrument.

The invention will be more fully described and explained in thefollowing specification, illustrated in the accompanying drawings andpointed out in the appended claims.

In the drawings, Figure l is a fragmentary longitudinal sectional viewof my device, with its plugging point removed. Fig. 2 is an endelevation of the same. Fig. 3 is a fragmentary view of the entering endof the plugging point.

eferring now more particularly to the drawings, reference numeral 22designates the central shaft of a form of dental instrument for use inplugging teeth, which is recessed and threaded as shown, to receive aplugger bit 23.

The shank of my improved form of plugger bit is split, as indicated at24 and 24 the ..portion 24..- being threaded as shown, and transverselythrough it is an aperture indicated at 25 in which is a pin 26 which issecured to a leaf spring 27 one end of which may be upturned as at 28and its opposite end secured by means of a screw 29 to the bottom of aslot which is indicated at 30. In order to change the plugger bits allthat is necessary is to insert the split end 2% of the same into therecessed portion of the shaft 1 and press said plugger bit firmly intoplace, the pin 26 snapping into the aperture 31 in the said portion 24,and to remove the plugger bit it is only necessary to lift upwardly uponthe upturned end of the spring 27 until the free end of the pin 26clears the aperture 31. The above described means is effective to securea plugger bit in place with suflicient firmness for ordinary use, butwhen it occurs that a more firm joint must be had the use of an ordinaryplugger bit does not in anywise interfere therewith because in that casethe portion 24* may be removed and the ordinary plugger bit secured inplace as usual. As indicated, however,

Copies of this patent may be obtained for :five cents each, byaddressing the Washington, D. G.

the necessity for this does not frequently occur and the extra timerequired for removing the portion 24, whenever such necessity doesoccur, may therefore be said to be negligible.

The invention consists solely in the bit and applicant does not attemptto claim more than this.

I have described a particular form of embodiment of my invention but Iam aware that many minor changes therein will readily suggest themselvesto others skilled in the art without departing from the spirit and scopeof the invention and I therefore desire to avoid being limited to theexact form shown and described.

What I claim is l. The combination with the internally threaded socketof a dental instrument, of a sectional bit and means for separating thesections of the bit while one of the sections remains screwed into thesaid socket, the said means including a fully threaded end upon one ofthe sections which is adapted to be screwed into the socket, the saidsection being split in the direction of its length and behind its fullythreaded end, whereby a portion of the socket is left open when the saidfully threaded end is in place, the other section of the bit beingsimilarly split and adapted to be slipped into and out of the said openportion of the socket when the other section is in place.

2. The combination with the internally threaded socket of a dentalinstrument, of a sectional bit and means for separating the sections ofthe bit while one of the sections remains screwed into the said socket,the said means including a fully threaded end upon one of the sectionswhich is adapted to be screwed into the socket, the said section beingsplit in the direction of its length and behind its fully threaded end,whereby a portion of the socket is left open when the said fullythreaded end is in place, the other section of the bit being similarlysplit and adapted to he slipped into and out of the said open portion ofthe socket, and means for holding the last mentioned section in place,said means including a spring-actuated pin.

HARRY M. BROOK. Witnesses:

FRED P. GORIN, R. D. SMALLEY.

Commissioner of Patents,

